I recently tuned my 2002 silverado with a brand new 5.3 crate motor about 1500 miles,my question is what rpm is best on the 1-2 shift at wot. It shifted stock at 5500 rpms I added another 200 rpm's so it shifts at 5700 rpm's seems to like it better but am I safe? This tune was done with a superchips flashpaq for all the critics of superchips it made a HUGE difference in performance mode also running stainless shorty headers flowmaster muffler(not sure which one but at wot it's LOUD) and a kn cold air intake. I also added 20 psi line pressure to try and firm up the sloppy 1-2 shift it did help but still far from a "firm" shift. I guess I'm spoiled with my mark viii which will roast 2nd gear!!